/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Lucene.Net.Index
{
    internal class ReadOnlySegmentReader : SegmentReader
    {
        internal static void NoWrite()
        {
            throw new System.Exception("This IndexReader cannot make any changes to the index (it was opened with readOnly = true)");
        }

        protected internal override void AcquireWriteLock()
        {
            NoWrite();
        }

        // Not synchronized
        public override bool IsDeleted(int n)
        {
            return deletedDocs != null && deletedDocs.Get(n);
        }
    }
}
